Originally Posted by
wylk
Correct. It might be possible that the lock is unlocked but that the bolts have moved enough to keep the door from opening. In that case, some firm persuasion on the ones that interlock with the other door, which should be entirely exposed on the left side of the locked door, might get them all to retract again. On the other hand I believe it's possible to fully lock the right-hand door with the left-hand door open, i.e. operator error. But it's worth a try.
While there may not be much room to work with, it might also be possible to get at the lock's back via the open door and work from there, but it wasn't designed that way of course. Good light, a mirror, possibly a camera that can take photos very close up, would be helpful.